global atmospheric circulation

Question 1

explain the process

Answer 1

sun warms the earth at the equator causing the air to rise creating a low pressure belt
as the air rises it cools and moves away from the equator
30 north and south the cool air sinks creating a high pressure belt
at the ground surface the cool air either moves back towards the equator as trade winds or carries on towards the poles as westerlies
these winds curve because of the Coriolis effect
60 north and south warmer surface winds meet colder air from the poles. the warmer air rises creating low pressure
some air moves back towards the equator and the rest moves on towards the poles
at the poles the cool air sinks creating high pressure, this is then drawn back towards the equator

Question 2

how does the GAC affect weather

Answer 2

at the equator the earths surface recieves a lot of radiation so it is warm which forms clouds, meaning it rains a lot.
at 30 degrees the air has has released most of its moisture so there are few clouds and little rain. - meaning deserts are found here.
uk lies close to the low pressure zone at 60 degrees north - warm air brings lots of rainfall carried by westerly winds.